HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 159)

143 HEIDENHAIN TNC 410, TNC 426, TNC 430
Calling the Cycle
Prerequisites
The following data must always be programmed before
a cycle call
■ G30/G31 for graphic display (needed only for
test graphics)
■ Tool call
■ Direction of spindle rotation (M functions M3/M4)
■ Define cycle
For some cycles, additional prerequisites must be
observed. They are described with the individual cycle.
The following cycles become effective automatically as soon as
they are defined in the part program. These cycles cannot and must
not be called:
■ Cycles for circular and linear hole patterns
■ SL cycle CONTOUR GEOMETRY
■ SL cycle CONTOUR DATA (not TNC 410)
■ Cycle G62 TOLERANCE (not TNC 410)
■ Coordinate transformation cycles
■ Cycle G04 DWELL TIME
All other cycles are called as described below.
If the TNC is to execute the cycle once after the last programmed
block, program the cycle call with the miscellaneous function M99
or with G79:
If the TNC is to execute the cycle automatically after every
positioning block, program the cycle call with M89 (depending on
machine parameter 7440).
To cancel M89, enter
■ M99 or
■ G79 or
■ a new cycle
8.1 Gener
al Inf
or
mation on Cy
cles
Working with the secondary axes U/V/W
The TNC performs infeed movements in the axis
that was defined in the TOOL CALL block as the
spindle axis. It performs movements in the working
plane only in the principle axes X, Y or Z. Exceptions:
■ you program secondary axes for the side lengths
in cycles G74 SLOT MILLING and G75/G76
POCKET MILLING
■ You program secondary axes in the contour
geometry subprogram of an SL cycle.
Kkap8.pm6 29.06.2006, 08:06 143